Missing either an H (to be "sulfonic acid" per filename) or an anionic charge (and renamed to be "sulfonate" conjugate base) on the single-bonded oxygen. Have File:Acido dodecilbenzensolfonico 1.png as alt. The cited "pubchem" source often makes this sort of mistake:( DMacks (talk) 03:49, 20 May 2019 (UTC)

Category for methylene groups containing a subcategory for methylene group (methanediyl group) and for files that are not methylene groups. Imo it's incorrect, according to IUPAC rules there is only one methylene group (and there is a category for this group already) and I don't know what else can be added to this cat. Wostr(talk) 23:11, 16 November 2018 (UTC) PS Probably Category:Methanediyl group should be renamed to Category:Methylene group and Category:Methylene groups may be switched to redirect. Wostr(talk) 23:13, 16 November 2018 (UTC)

@Grasso Luigi: As the creator of the category it would be good to hear your opinion on the suggestions above. --Leyo 11:21, 3 December 2018 (UTC)

Ball-and-stick and calotte models absolutely need to have an accurate geometry and size of atoms. Otherwise, they are misleading like in this case. Hence, still Delete. --Leyo 22:21, 22 December 2015 (UTC)

Ball-and-stick and calotte models absolutely need to have an accurate geometry and size of atoms. Otherwise, they are misleading like in this case. Hence, still Delete. --Leyo 22:22, 22 December 2015 (UTC)

Ball-and-stick and calotte models absolutely need to have an accurate geometry and size of atoms. Otherwise, they are misleading like in this case. Hence, still Delete. --Leyo 22:23, 22 December 2015 (UTC)

Ball-and-stick and calotte models absolutely need to have an accurate geometry and size of atoms. Otherwise, they are misleading like in this case. Hence, still Delete. --Leyo 22:24, 22 December 2015 (UTC)